Patents by Inventor Yorikazu Nakamura
Yorikazu Nakamura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10029528Abstract: A urethane bumper spring is produced from a urethane raw material containing a polyester-based polyol as a polyol component and diphenylmethane diisocyanate as an isocyanate component, and includes: a skin layer; and a core portion, in which the skin layer has a density (Da) and a foamed cell diameter (Ra), and the core portion has a density (Db) and a foamed cell diameter (Rb). The density (Da), the foamed cell diameter (Ra), the density (Db), and the foamed cell diameter (Rb) satisfy relationships shown in the following expressions: 1.0?Da/Db<1.34 (1) and 0.53<Ra/Rb?1.0 (2). Accordingly, the urethane bumper spring can achieve a cost reduction while having durability and settling resistance under high load and high deformation.Type: GrantFiled: August 11, 2016Date of Patent: July 24, 2018Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Yasuo Suzuki, Takuya Hasegawa, Yorikazu Nakamura, Masanobu Mizusaki
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Patent number: 9677636Abstract: An anti-vibration rubber member includes: a rubber elastic body that is made of a self-lubricating rubber containing an elastomer and a bleeding lubricant; a coating film that covers at least a portion of a sliding inner surface that is a surface of the rubber elastic body disposed on an inner side of a sliding surface, contains a resin having a mercapto group and a solid lubricant containing polytetrafluoroethylene particles and ultrahigh molecular weight polyethylene particles, and is deformable to follow up deformation of the rubber elastic body; and a lubricating film that covers at least a portion of a surface of the coating film, is formed by including the bleeding lubricant having penetrated the coating film from the rubber elastic body and oozing onto the surface of the coating film, and forms at least a portion of the sliding surface.Type: GrantFiled: March 3, 2015Date of Patent: June 13, 2017Assignees: SUMITOMO RIKO COMPANY LIMITED, STT INC.Inventors: Yorikazu Nakamura, Hiroyuki Matsumura, Takahisa Suzuki
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Publication number: 20160347140Abstract: A urethane bumper spring is produced from a urethane raw material containing a polyester-based polyol as a polyol component and diphenylmethane diisocyanate as an isocyanate component, and includes: a skin layer; and a core portion, in which the skin layer has a density (Da) and a foamed cell diameter (Ra), and the core portion has a density (Db) and a foamed cell diameter (Rb). The density (Da), the foamed cell diameter (Ra), the density (Db), and the foamed cell diameter (Rb) satisfy relationships shown in the following expressions: 1.0?Da/Db<1.34 (1) and 0.53<Ra/Rb?1.0 (2). Accordingly, the urethane bumper spring can achieve a cost reduction while having durability and settling resistance under high load and high deformation.Type: ApplicationFiled: August 11, 2016Publication date: December 1, 2016Applicant: Sumitomo Riko Company LimitedInventors: Yasuo Suzuki, Takuya Hasegawa, Yorikazu Nakamura, Masanobu Mizusaki
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Patent number: 9470316Abstract: A protective cover including a bellows portion wherein a plurality of valleys and peaks are arranged alternately. The valleys include a plurality of large valleys and a plurality of intermediate valleys whose inside and outside diameter dimensions at bottoms are greater than those of the large valleys, and the large valleys and the intermediate valleys are arranged alternately. Small valleys whose inside and outside diameter dimensions at bottoms are greater than those of the intermediate valleys are respectively arranged between the large valleys and the intermediate valleys. The peaks are respectively arranged between the large valleys and the small valleys as well as between the intermediate valleys and the small valleys, and apexes of the peaks have a same outside diameter dimension as one another. The apexes of the peaks are made thinner than the bottoms of the large valleys.Type: GrantFiled: October 4, 2013Date of Patent: October 18, 2016Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Hiroyuki Matsumura, Yorikazu Nakamura
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Publication number: 20150167767Abstract: An anti-vibration rubber member includes: a rubber elastic body that is made of a self-lubricating rubber containing an elastomer and a bleeding lubricant; a coating film that covers at least a portion of a sliding inner surface that is a surface of the rubber elastic body disposed on an inner side of a sliding surface, contains a resin having a mercapto group and a solid lubricant containing polytetrafluoroethylene particles and ultrahigh molecular weight polyethylene particles, and is deformable to follow up deformation of the rubber elastic body; and a lubricating film that covers at least a portion of a surface of the coating film, is formed by including the bleeding lubricant having penetrated the coating film from the rubber elastic body and oozing onto the surface of the coating film, and forms at least a portion of the sliding surface.Type: ApplicationFiled: March 3, 2015Publication date: June 18, 2015Applicants: SUMITOMO RIKO COMPANY LIMITED, STT INC.Inventors: Yorikazu NAKAMURA, Hiroyuki MATSUMURA, Takahisa SUZUKI
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Patent number: 9033320Abstract: An anti-vibration rubber member includes: a rubber elastic body that is made of a self-lubricating rubber containing an elastomer and a bleeding lubricant; a coating film that covers at least a portion of a sliding inner surface that is among a surface of the rubber elastic body and disposed on an inner side of the sliding surface, contains a resin having a mercapto group, is deformable to follow up deformation of the rubber elastic body, and is formed with a plurality of minute holes capable of reserving the bleeding lubricant which has oozed out of the rubber elastic body; and a lubricating film that covers at least a portion of a surface of the coating film, is formed to include the bleeding lubricant penetrating the coating film from the rubber elastic body and oozing onto the surface of the coating film, and forms at least a portion of the sliding surface.Type: GrantFiled: May 14, 2013Date of Patent: May 19, 2015Assignees: SUMITOMO RIKO COMPANY LIMITED, STT INC.Inventors: Yorikazu Nakamura, Hiroyuki Matsumura, Takahisa Suzuki
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Patent number: 8894079Abstract: An upper support for vehicle suspension including: an inner cylindrical member; an outer cylindrical member spaced apart peripherally outward from the inner cylindrical member; a rubber elastic body interposed between the inner cylindrical member and the outer cylindrical member while elastically connecting the two members; and a flange portion extending radially outward from the outer cylindrical member while being adapted to be overlapped and fixed onto a mounting portion of a vehicle body. A fastening seat portion is provided to the flange portion over a prescribed area and has a contact face adapted to be in contact against the mounting portion of the vehicle body. A concave/convex portion is formed on the contact face of the fastening seat portion over a prescribed area thereof.Type: GrantFiled: March 11, 2013Date of Patent: November 25, 2014Assignees: Tokai Rubber Industries, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Hiroyuki Matsumura, Yorikazu Nakamura, Satoshi Uchida, Yusuke Washitani
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Publication number: 20140035232Abstract: A protective cover including a bellows portion wherein a plurality of valleys and peaks are arranged alternately. The valleys include a plurality of large valleys and a plurality of intermediate valleys whose inside and outside diameter dimensions at bottoms are greater than those of the large valleys, and the large valleys and the intermediate valleys are arranged alternately. Small valleys whose inside and outside diameter dimensions at bottoms are greater than those of the intermediate valleys are respectively arranged between the large valleys and the intermediate valleys. The peaks are respectively arranged between the large valleys and the small valleys as well as between the intermediate valleys and the small valleys, and apexes of the peaks have a same outside diameter dimension as one another. The apexes of the peaks are made thinner than the bottoms of the large valleys.Type: ApplicationFiled: October 4, 2013Publication date: February 6, 2014Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Hiroyuki MATSUMURA, Yorikazu NAKAMURA
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Publication number: 20130285298Abstract: An anti-vibration rubber member includes: a rubber elastic body made of a self-lubricating rubber containing an elastomer and a bleeding lubricant; a coating film that covers at least a portion of a sliding inner surface that is among a surface of the rubber elastic body and disposed on an inner side of the sliding surface, contains a resin having a mercapto group, is deformable to follow up deformation of the rubber elastic body, and is formed with a plurality of minute holes capable of reserving the bleeding lubricant which has oozed out of the rubber elastic body; and a lubricating film that covers at least a portion of a surface of the coating film, is formed to include the bleeding lubricant penetrating the coating film from the rubber elastic body and oozing onto the surface of the coating film, and forms at least a portion of the sliding surface.Type: ApplicationFiled: May 14, 2013Publication date: October 31, 2013Inventors: Yorikazu NAKAMURA, Hiroyuki MATSUMURA, Takahisa SUZUKI
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Publication number: 20130249180Abstract: An upper support for vehicle suspension including: an inner cylindrical member; an outer cylindrical member spaced apart peripherally outward from the inner cylindrical member; a rubber elastic body interposed between the inner cylindrical member and the outer cylindrical member while elastically connecting the two members; and a flange portion extending radially outward from the outer cylindrical member while being adapted to be overlapped and fixed onto a mounting portion of a vehicle body. A fastening seat portion is provided to the flange portion over a prescribed area and has a contact face adapted to be in contact against the mounting portion of the vehicle body. A concave/convex portion is formed on the contact face of the fastening seat portion over a prescribed area thereof.Type: ApplicationFiled: March 11, 2013Publication date: September 26, 2013Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, TOKAI RUBBER INDUSTRIES, LTD.Inventors: Hiroyuki MATSUMURA, Yorikazu NAKAMURA, Satoshi UCHIDA, Yusuke WASHITANI
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Patent number: 8517404Abstract: To provide a toe correct bush having excellent durability and a novel structure, the toe correct bush effectively achieving improvement in running stability during steering with a toe correction function and improvement in straight line performance with an intermediate restraining plate. A first intermediate restraining member is provided between opposing surfaces of an inner inclined portion and an outer inclined portion and is fixed to a compression rubber, the first intermediate restraining member spreading and being isolated from the opposing surfaces of the inner inclined portion and the outer inclined portion. A second intermediate restraining member is provided independent from the first intermediate restraining member between opposing surfaces of an inner flange and an outer flange and is fixed to a connecting rubber, the second intermediate restraining member spreading and being isolated from the opposing surfaces of the inner flange and the outer flange.Type: GrantFiled: September 13, 2012Date of Patent: August 27, 2013Assignee: Tokai Rubber Industries, Ltd.Inventors: Ryusuke Yamada, Yorikazu Nakamura
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Publication number: 20130001915Abstract: To provide a toe correct bush having excellent durability and a novel structure, the toe correct bush effectively achieving improvement in running stability during steering with a toe correction function and improvement in straight line performance with an intermediate restraining plate. A first intermediate restraining member is provided between opposing surfaces of an inner inclined portion and an outer inclined portion and is fixed to a compression rubber, the first intermediate restraining member spreading and being isolated from the opposing surfaces of the inner inclined portion and the outer inclined portion. A second intermediate restraining member is provided independent from the first intermediate restraining member between opposing surfaces of an inner flange and an outer flange and is fixed to a connecting rubber, the second intermediate restraining member spreading and being isolated from the opposing surfaces of the inner flange and the outer flange.Type: ApplicationFiled: September 13, 2012Publication date: January 3, 2013Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Ryusuke YAMADA, Yorikazu NAKAMURA
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Publication number: 20110170814Abstract: A stabilizer bushing wherein there is low friction resistance between the stabilizer bushing and a stabilizer bar, and a coating film is not prone to separation from a rubber elastic body. Stabilizer bushings include: a rubber elastic body that is made of a self-lubricating rubber containing an elastomer and a bleeding lubricant, that includes a holding hole that holds a stabilizer bar on a radial inner side, and that is shaped as a cylinder attached to a body of a vehicle by brackets, a coating film that covers an inner circumferential surface of the holding hole, that contains a resin having a mercapto group, and that is deformable to follow up deformation of the rubber elastic body; and a lubricating film that is formed on a surface of the coating film by the bleeding lubricant of the rubber elastic body penetrating the coating film and oozing onto the surface of the coating film, and that is in relative sliding contact with an outer circumferential surface of the stabilizer bar.Type: ApplicationFiled: September 29, 2009Publication date: July 14, 2011Applicants: TOKAI RUBBER INDUSTRIES, LTD., TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yorikazu Nakamura, Kenichi Kato, Keisuke Miwa
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Publication number: 20110031664Abstract: Provided is an anti-vibration rubber member wherein there is low friction resistance between the anti-vibration rubber member and a mating member, and a coating film is not prone to separation from a rubber elastic body, and a production method thereof. An anti-vibration rubber member absorbs at least a portion of the vibration of a mating member and has a sliding surface that is relatively in sliding contact with the mating member.Type: ApplicationFiled: September 29, 2009Publication date: February 10, 2011Applicants: TOKAI RUBBER INDUSTRIES, LTD., STT, INC.Inventors: Yorikazu Nakamura, Kenichi Kato, Takahisa Suzuki
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Patent number: 6908076Abstract: An upper mount in a suspension system of an automotive vehicle, including a metal housing, a cylindrical body accommodated in the housing, and an outer metal sleeve bonded to the outer circumferential surface of the elastic body and fitted in the housing, wherein the elastic body has an annular sealing lip integrally formed of a rubber material and located radially outwardly of a central opening formed through an upper wall portion of the housing such that the sealing lip is held in pressing contact with an inner surface of the upward wall portion or a cylindrical wall portion of the housing, for preventing a flow of an aqueous component such as water from the central opening to the outer metal sleeve.Type: GrantFiled: March 18, 2003Date of Patent: June 21, 2005Assignee: Tokai Rubber Industries, Ltd.Inventors: Yukio Hayashi, Koichi Kobayashi, Michiharu Hikosaka, Yorikazu Nakamura
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Patent number: 6770237Abstract: A method of producing a dust cover assembly comprising the steps of: preparing a fixing member having a mounting bore to be fitted on a shock absorber's piston rod, and an engaging portion formed in its outer circumferential surface as an axially undercut portion; preparing a tubular parison having a large diameter portion at its one axial end portion; positioning the large diameter portion to be disposed radially outwardly of the outer circumferential surface of the fixing member; closing a blow mold to form a mold cavity around the parison and to hold the large diameter portion of the parison in close contact with the outer circumferential surface of the fixing member; and blow molding the parison by introducing a compressed gas into the blow mold through the mounting bore, thereby molding the dust cover. A dust cover assembly and a shock absorber equipped with the dust cover assembly are also disclosed.Type: GrantFiled: May 12, 2003Date of Patent: August 3, 2004Assignee: Tokai Rubber Industries, Ltd.Inventor: Yorikazu Nakamura
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Patent number: 6648110Abstract: A method of producing a dust cover assembly comprising the steps of: preparing a fixing member having a mounting bore to be fitted on a shock absorber's piston rod, and an engaging portion formed in its outer circumferential surface as an axially undercut portion; preparing a tubular parison having a large diameter portion at its one axial end portion; positioning the large diameter portion to be disposed radially outwardly of the outer circumferential surface of the fixing member; closing a blow mold to form a mold cavity around the parison and to hold the large diameter portion of the parison in close contact with the outer circumferential surface of the fixing member; and blow molding the parison by introducing a compressed gas into the blow mold through the mounting bore, thereby molding the dust cover. A dust cover assembly and a shock absorber equipped with the dust cover assembly are also disclosed.Type: GrantFiled: October 23, 2001Date of Patent: November 18, 2003Assignee: Tokai Rubber Industries, Ltd.Inventor: Yorikazu Nakamura
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Publication number: 20030192754Abstract: A method of producing a dust cover assembly comprising the steps of: preparing a fixing member having a mounting bore to be fitted on a shock absorber's piston rod, and an engaging portion formed in its outer circumferential surface as an axially undercut portion; preparing a tubular parison having a large diameter portion at its one axial end portion; positioning the large diameter portion to be disposed radially outwardly of the outer circumferential surface of the fixing member; closing a blow mold to form a mold cavity around the parison and to hold the large diameter portion of the parison in close contact with the outer circumferential surface of the fixing member; and blow molding the parison by introducing a compressed gas into the blow mold through the mounting bore, thereby molding the dust cover. A dust cover assembly and a shock absorber equipped with the dust cover assembly are also disclosed.Type: ApplicationFiled: May 12, 2003Publication date: October 16, 2003Applicant: Tokai Rubber Industries, Ltd.Inventor: Yorikazu Nakamura
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Publication number: 20030178269Abstract: An upper mount in a suspension system of an automotive vehicle, including a metal housing, a cylindrical body accommodated in the housing, and an outer metal sleeve bonded to the outer circumferential surface of the elastic body and fitted in the housing, wherein the elastic body has an annular sealing lip integrally formed of a rubber material and located radially outwardly of a central opening formed through an upper wall portion of the housing such that the sealing lip is held in pressing contact with an inner surface of the upward wall portion or a cylindrical wall portion of the housing, for preventing a flow of an aqueous component such as water from the central opening to the outer metal sleeve.Type: ApplicationFiled: March 18, 2003Publication date: September 25, 2003Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Yukio Hayashi, Koichi Kobayashi, Michiharu Hikosaka, Yorikazu Nakamura
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Publication number: 20020053494Abstract: A method of producing a dust cover assembly comprising the steps of: preparing a fixing member having a mounting bore to be fitted on a shock absorber's piston rod, and an engaging portion formed in its outer circumferential surface as an axially undercut portion; preparing a tubular parison having a large diameter portion at its one axial end portion; positioning the large diameter portion to be disposed radially outwardly of the outer circumferential surface of the fixing member; closing a blow mold to form a mold cavity around the parison and to hold the large diameter portion of the parison in close contact with the outer circumferential surface of the fixing member; and blow molding the parison by introducing a compressed gas into the blow mold through the mounting bore, thereby molding the dust cover. A dust cover assembly and a shock absorber equipped with the dust cover assembly are also disclosed.Type: ApplicationFiled: October 23, 2001Publication date: May 9, 2002Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventor: Yorikazu Nakamura